Multithreading problem - in j2me - webservice connection

I am newbie to j2me.
I am using threading concepts to connect with webservices.
I have two classes - Sync (which acts as main ) and TestConnectionThread(which is used to connect webservice and for checking whether testConnection is succeed)
TestConnectionThread contains post() method which accepts the webservice url and starts the thread(calls run() method)

What I want is - child thread(i.eTestConnectionThread) has to complete first before Sync has to complete. I am not able to use childThread.join() in Sync class because I am using j2me cldc 1.1. So, I tried with, Thread.sleep(), Thread.yield in sync class. but of no use.

Every time, the child Thread is creating successfully and near the ht.call method, it is waiting for some time(because it has to hit webservices and get back the response). So, in this mean while, the control is giving back to the parent( i.e Sync). Once it happend, childThread is not getting the control until the parent (Sync) is over. (Even though I set high priority to childThread or increasing the time in while loop). So, because of that .. even though the testConnection is succeeded, in Sync it is showing isConnection is failed.
Please let me know how can i achieve - Sync has to wait until TestConnectionThread connection is succeded.
(i.e 'TestConnection Thread - GetResult()- got response from webservice:true' has to appear before 'Sync - checkTestConnection() - isConnection value =false' sothat isConnection value will print true)